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(No Model.) G. G. PREPANTAINE/ SEGTIDNAL BOILER. No. 392,881. Patented Nov. 13, 1888.

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GEORGE G. PREFANTAINE, OF WHITEHALL, NEW YORK.

SECTIONAL BOILER.

SPECIFICATION forming part of Letters Patent No. 392,881, dated November 13, 1888.

Application filed August 20, 1888. Serial No. 283,191.

To all whom it may concern.-

Be it known that I, GEORGE G. PREFAN- TAINE, of Whitehall, in the county of Washington and State of New York, have invented certain new and useful Improvements in Sectional Boilers; and I do hereby declare the following to be a full, clear, and exact descrip tion of the invention, such as will enable others skilled in the art to which it pertains to make and use it, refcrcnoebeing had to the accompanying drawings, which form part of this specification. Y

My invention relates to an improvement in sectional boilers; and it consists in the combination of a waterpipe which extends partially around the grate-bars, the hollow grate-bars connected at opposite ends to this pipe, vertical pipes which extend from the water-pipe, hollow castings, water-pipes of unequal sizes which connect the castings together, and the drum with which the pipes and castings are connected, as will be more fully described hereinafter.

The object of my invention is to construct a sectional boiler in which the hollow sections which serve to connect the pipes together are united by a series of pipes, one of which extends from the bottoni of one casting into the top of another and is of larger diameter than the other pipes, thus causing a free circulation of the water to take place.

Figure 1 represents a side elevation of a boiler which embodies my invention. Fig. 2 is a detached vertical section of a portion of the pipes, showing their relative arrangement.

A represents a large pipe which extends around the hollow grate-bars B, and into which the feed-water is forced. This pipe extends around three sides of the gratobars and is connected at its ends to the cross-pipe G. The grate-bars extend in between these pipes and connect them together in the usual manner. From these pipes extend the vertical pipes D, which are provided with elbowjoints F, and from these joints extend short (No model.)

pipes H, which connect with the lower ends of the hollow castings I. These castings may be given any desired shape, and are connected together by means of smaller pipes, J, and the large pipe L. These pipes extend across so as to make connection with the top of one casting and the bottom of another. These smaller pipes, J, are made of the same size; but the pipe L is of much larger diameter, and also extends from the bottom of one casting directly into the top of another, so as to allow a much greater volume of water to circulate back and forth through it.

Extending at right angles across the tops of the two sets of pipes J and L is a drum, 0,

with which the upper castings are connected by means of short pipes P, as shown, and ex tending from this drum are the steam or feed pipes Q. As the fire is built upon the grate bars, which are hollow and are filled with water, and as the vertical pipes connected with the large pipe A are surrounded by the fire, and as the products ofeombustion rise directly around and through the connecting-pipes J L and the castings to which they are secured and around the stean1-drum, it will readily be seen that the greatest amount of heat possible is absorbed by the pipes and used in generating steam. This construction enables a very cheap, simple, and durable sectional boiler to be made.

Having thus described my invention, I

In a sectional boiler, the combination of the large pipe A, the water grate-bars B, the pipes extending from the pipe A to the hollow castings, pipes J L, for connecting them together, and the drum with which the pipes and castings are connected, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE G. PREFANTAINE.

Vitnesses:

I. F. X. RENoIs, H. A. SrEVENs. 

